New freeze dried meat treats from Evangers

http://www.evangersdogfood.com/cat/treats_cat.html

Newbies - Other popular low carb treats:

Real Food Toppers
Halo Liv-A-Littles
WildSide Salmon
Whole Life
Catswell

OnlyNaturalPet.com All Meat Bites
OnlyNaturalPet.com Freeze Dried Turkey Liver
OnlyNaturalPet.com Poultry Crispies

Other low carb treats:
http://www.felinediabetes.com/low-carb-cat-treats.htm
http://www.gorbzilla.com/sugarcat_treats.htm
http://www.felinediabetes.com/homemade-treats.htm

Anything that is 100% meat with nothing else is best. There are many brands you can feed. Check the dog treat aisle for freeze dried 100% meat treats. Some freeze dried RAW patties are great for treats, just make sure there is no source of grain or sugar. Catnip and cat grass are great, too.